1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
|
/* ______ ___ ___
* /\ _ \ /\_ \ /\_ \
* \ \ \L\ \\//\ \ \//\ \ __ __ _ __ ___
* \ \ __ \ \ \ \ \ \ \ /'__`\ /'_ `\/\`'__\/ __`\
* \ \ \/\ \ \_\ \_ \_\ \_/\ __//\ \L\ \ \ \//\ \L\ \
* \ \_\ \_\/\____\/\____\ \____\ \____ \ \_\\ \____/
* \/_/\/_/\/____/\/____/\/____/\/___L\ \/_/ \/___/
* /\____/
* \_/__/
*
* System drag&drop example.
*
* This example shows how an Allegro window can receive pictures
* (and text) from other applications.
*
* See readme.txt for copyright information.
*/
#define ALLEGRO_UNSTABLE
#include <allegro5/allegro.h>
#include <allegro5/allegro_font.h>
#include <allegro5/allegro_ttf.h>
#include <allegro5/allegro_color.h>
#include <allegro5/allegro_image.h>
#include <allegro5/allegro_primitives.h>
#include "common.c"
#define XDIV 3
#define YDIV 4
// We only accept up to 25 lines of text or files at a time.
typedef struct Cell {
char *rows[25];
ALLEGRO_BITMAP *bitmap;
} Cell;
int main(int argc, char **argv)
{
ALLEGRO_DISPLAY *display;
ALLEGRO_TIMER *timer;
ALLEGRO_EVENT_QUEUE *queue;
ALLEGRO_FONT *font;
bool done = false;
bool redraw = true;
Cell grid[XDIV * YDIV];
int drop_x = -1;
int drop_y = -1;
(void)argc;
(void)argv;
// Initialize everything to NULL
for (int i = 0; i < XDIV * YDIV; i++) {
grid[i].rows[0] = strdup("drop file or text here");
for (int r = 1; r < 25; r++) grid[i].rows[r] = NULL;
grid[i].bitmap = NULL;
}
if (!al_init()) {
abort_example("Failed to init Allegro.\n");
}
al_init_image_addon();
al_init_primitives_addon();
al_init_font_addon();
al_init_ttf_addon();
init_platform_specific();
ALLEGRO_MONITOR_INFO info;
al_get_monitor_info(0, &info);
// Make the window half as wide as the desktop and 4:3 aspect
int w = (info.x2 - info.x1) / 2;
int h = w * 3 / 4;
// Turn on drag/drop support
al_set_new_display_flags(ALLEGRO_DRAG_AND_DROP);
display = al_create_display(w, h);
if (!display) {
abort_example("Error creating display.\n");
}
if (!al_install_keyboard()) {
abort_example("Error installing keyboard.\n");
}
font = al_load_font("data/DejaVuSans.ttf", 20, 0);
if (!font) {
abort_example("Could not load font.\n");
}
timer = al_create_timer(1 / 60.0);
queue = al_create_event_queue();
al_register_event_source(queue, al_get_keyboard_event_source());
al_register_event_source(queue, al_get_timer_event_source(timer));
// drag&drop events will come from the display, if enabled
al_register_event_source(queue, al_get_display_event_source(display));
al_start_timer(timer);
while (!done) {
ALLEGRO_EVENT event;
int fh = al_get_font_line_height(font);
if (redraw && al_is_event_queue_empty(queue)) {
// draw a grid with the dropped text rows or files
ALLEGRO_COLOR c1 = al_color_name("gainsboro");
ALLEGRO_COLOR c2 = al_color_name("orange");
al_clear_to_color(al_map_rgb_f(0, 0, 0));
for (int y = 0; y < YDIV; y++) {
for (int x = 0; x < XDIV; x++) {
int gx = x * w / XDIV;
int gy = y * h / YDIV;
if (grid[x + y * XDIV].bitmap) {
ALLEGRO_BITMAP *bmp = grid[x + y * XDIV].bitmap;
float bw = al_get_bitmap_width(bmp);
float bh = al_get_bitmap_height(bmp);
float s = w / XDIV / bw;
if (s > (h / YDIV - fh) / bh) s = (h / YDIV - fh) / bh;
al_draw_scaled_bitmap(bmp, 0, 0, bw, bh, gx, gy + fh, bw * s, bh * s, 0);
}
for (int r = 0; r < 25; r++) {
if (!grid[x + y * XDIV].rows[r]) break;
al_draw_textf(font, c1, gx, gy + r * fh,
0, "%s", grid[x + y * XDIV].rows[r]);
}
if (drop_x >= gx && drop_x < gx + w / XDIV &&
drop_y >= gy && drop_y < gy + h / YDIV) {
al_draw_rectangle(gx, gy, gx + w / XDIV, gy + h / YDIV, c2, 2);
}
else {
al_draw_rectangle(gx, gy, gx + w / XDIV, gy + h / YDIV, c1, 0);
}
}
}
al_flip_display();
redraw = false;
}
al_wait_for_event(queue, &event);
switch (event.type) {
case ALLEGRO_EVENT_KEY_DOWN:
if (event.keyboard.keycode == ALLEGRO_KEY_ESCAPE) {
done = true;
}
break;
case ALLEGRO_EVENT_DISPLAY_CLOSE:
done = true;
break;
case ALLEGRO_EVENT_TIMER:
redraw = true;
break;
case ALLEGRO_EVENT_DROP:
drop_x = event.drop.x;
drop_y = event.drop.y;
int col = drop_x * XDIV / w;
int row = drop_y * YDIV / h;
int i = col + row * XDIV;
if (event.drop.text) {
if (event.drop.row == 0) {
// clear the previous contents of the cell
for (int r = 0; r < 25; r++) {
if (grid[i].rows[r]) {
al_free(grid[i].rows[r]);
grid[i].rows[r] = NULL;
}
}
// insert the first row/file
grid[i].rows[0] = event.drop.text;
if (event.drop.is_file) {
// if a file, try and load it as a bitmap to display
if (grid[i].bitmap) al_destroy_bitmap(grid[i].bitmap);
grid[i].bitmap = al_load_bitmap(grid[i].rows[0]);
}
}
else {
if (event.drop.row < 25) {
grid[i].rows[event.drop.row] = event.drop.text;
}
else {
al_free(event.drop.text);
}
}
}
if (event.drop.is_complete) {
// stop highlighting a cell when the drop is completed
drop_x = -1;
drop_y = -1;
}
break;
}
}
al_destroy_font(font);
return 0;
}
/* vim: set sts=3 sw=3 et: */
|
